Modular voltage regulators

ABSTRACT

A device includes a semiconductor die. The semiconductor die has formed thereon a plurality of multi-phase voltage regulator modules of the same design formed on a common semiconductor substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is divisional application of U.S. patent applicationSer. No. 16/523,320 filed Jul. 26, 2019, which is a continuationapplication of U.S. patent application Ser. No. 15/782,885 filed Oct.13, 2017, and of U.S. patent application Ser. No. 16/202,639 filed Nov.28, 2018, which is a divisional application of U.S. patent applicationSer. No. 15/782,885, the entirety of each of which is herebyincorporated by reference herein.

BACKGROUND

Voltage regulators are used extensively in electronic devices (e.g.,computers, servers, smart phones, etc.) to regulate voltage. The needs(e.g., regulated voltage level, current draw, etc.) of these differentand even similar electronic devices vary greatly. Typically, a specificvoltage regulator is designed for a small range of systems (or even foran individual device) based on the input current requirements of thosesystems.

Inductor elements are the largest elements of the voltage regulator, andconsume the most real estate. These inductor elements are one elementthat are subject to manufacturing defects. Voltage regulators thatexhibit manufacturing defects, such as in the inductor elements, arescrapped. This results in low yield manufacturing of voltage regulators.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the followingdetailed description when read with the accompanying figures. It isnoted that various features are not necessarily drawn to scale. In fact,the dimensions of the various features may be arbitrarily increased orreduced for clarity of discussion.

FIG. 1 illustrates an example of a multi-phase voltage regulator,according to certain embodiments.

FIG. 2 shows a circuit design of an individual phase circuit of avoltage regulator, according to certain embodiments.

FIG. 2A shows a circuit design of a multi-phase voltage regulatorcircuit, according to certain embodiments.

FIG. 3 illustrates a portion of a wafer on which multiple voltageregulators of the type shown in FIG. 1 are arrayed across the wafer,according to certain embodiments.

FIG. 4A illustrates a chip having four voltage regulator modules thatcan be formed from the wafer of FIG. 3, according to certainembodiments.

FIG. 4B illustrates a chip having two voltage regulator modules that canbe formed from the wafer of FIG. 3, according to certain embodiments.

FIG. 4C illustrates a chip having one voltage regulator module that canbe formed from the wafer of FIG. 3, according to certain embodiments.

FIG. 5 schematically illustrates a multichip package including a voltageregulator chip and a multi-voltage rail chip, according to certainembodiments.

FIG. 6 schematically illustrates a multichip package including a voltageregulator chip and a single-voltage rail chip, according to certainembodiments.

FIG. 7 illustrates an example of a multi-phase voltage regulator havinga defective phase disabled or disconnected, according to certainembodiments.

FIGS. 8 illustrates a vertical cross-section of a wafer having a voltageregulator before bump removal, according to certain embodiments.

FIGS. 8A illustrates a vertical cross-section of a wafer having avoltage regulator after bump removal, according to certain embodiments.

FIG. 9 illustrate an embodiment of a voltage regulator having a phasedisconnected from the regulator output, according to certainembodiments.

FIG. 9A is an enlarged view of a portion of FIG. 9.

FIG. 10 illustrates an example of a multi-phase voltage regulator havingredundant control logic, according to certain embodiments.

FIG. 11 illustrate a packaged device, according to certain embodiments.

FIG. 12 illustrates a method of making a voltage regulator, according tocertain embodiments.

FIG. 13 illustrates a method of reconfiguring a voltage regulator moduleto account for defects, according to certain embodiments.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The following disclosure describes various exemplary embodiments forimplementing different features of the subject matter. Specific examplesof components and arrangements are described below to simplify thepresent disclosure. These are, of course, merely examples and are notintended to be limiting. For example, it will be understood that when anelement is referred to as being “connected to” or “coupled to” anotherelement, it may be directly connected to or coupled to the otherelement, or one or more intervening elements may be present.

Disclosed herein are embodiments of a modular voltage regulator designthat allows for multiple voltage regulators tailored to the designrequirements of different products to be formed from an array ofidentical voltage regulators modules manufactured on the same wafersubstrate. Specifically, in embodiments, a voltage regulator module isarrayed across a wafer that can be cut into different sized dies,containing different numbers of voltage regulator modules, based on thespecific requirements of the system. The die is then packaged togetherwith a chip to which it is to provide regulated voltage, with thepackage connections configuring whether the voltage regulator modulesoperate independently of one another, to provide, for example, multipleregulated voltages to a multi-voltage domain chip or together, such asin a master slave configuration, to provide one regulated voltage outputfor, for example, a high current domain. This approach allows for onevoltage regulator module design to be used to provide a number ofdifferent voltage regulators.

Also disclosed herein are embodiments of a voltage regulator that isconfigurable to address manufacturing defects and thereby increaseyield. Specifically, in embodiments, the voltage regulator design isconfigured with the ability to disable individual phases of the voltageregulator based on manufacturing defects and/or to reconfigure thecontrol logic to only use the working circuits of the voltage regulator.

In embodiments, the voltage regulator can be provided in a package thatprovides connections to other electronic circuits, e.g., to a CPU orother electronic circuit to which the voltage regulator provides aregulated voltage and from which in certain embodiments the voltageregulator receives a reference voltage. In certain embodiments, themodular in-package voltage regulator can provide a much larger range ofcurrent delivery by coupling multiple voltage regulators together on acommon substrate. In certain embodiments, the modular in-package voltageregulator can also simultaneously provide a number of different voltagesfrom a smaller number of chips in the package than previous designs.This wide range of uses is accomplished with a single design andtape-out, rather than designing a separate product for each application,as would be required with other approaches. In addition, the effectiveyield of the process of making voltage regulators is better thantraditional voltage regulators due to the ability to selectively disablecircuits with manufacturing defects, as well as the ability to increasevolume of the same design.

A “package” or “multichip package” as used herein, in embodiments,includes a voltage regulator die, typically having solder bumps, and atleast one other die to which the voltage regulator provides a regulatedvoltage or voltages (e.g., a CPU die) also having solder bumps, coupledto and connected through a common package substrate. That single packageor multichip package forms a single product that can be coupled to aprinted circuit board in a larger electronic system or product.

FIG. 1 illustrates an example of a multi-phase voltage regulator,specifically a 16-phase voltage regulator 10 formed on a die 12. Theterm “phase” as used in the context of a “multi-phase” voltage regulatorrefers to time interleaving of the different clocks. Each phase isslightly offset in time (e.g. 0°, 90°, 180°, etc.) from each other.These “phased” outputs are shorted together to provide a robust outputvoltage of a voltage regulator, since each one has a response slightlyoffset from the others. The drivers and control logic are located in thecenter region 14 of the die 12, and the sixteen inductors 18 are placedover the circuitry layer. In certain embodiments, the inductors 18 arethe largest elements of the voltage regulator, and so the inductors 18take up more space on the die 12 than the drivers and control circuitry.That means that the size of the die needed for the voltage regulator islargely dictated by the size of and number of inductors 18. The voltageregulator input solder bumps 16 are provided for receiving both VDD andVSS reference voltages and control signals and are located in the centerregion 14 of the die 12 of the voltage regulator 10. The voltageregulator output (i.e., the reference voltage) is provided at the outputsolder bumps 20 located across the top and bottom of the die 12 of thevoltage regulator 10. The output solder 20 bumps are electricallycoupled to the inductor 18 outputs. It should be understood that apackage in which the voltage regulator 10 is provided couples the solderbumps 20 together to provide a common output of the voltage regulator10.

In conventional designs, a system that required a larger max currentwould require a separately designed voltage regulator with more phasesand/or larger inductors. And systems that required several differentindependent voltage inputs would require several voltage regulators,such as of the type shown in FIG. 1, formed on separate substrates andseparately designed for the different voltage domains. These separatevoltage regulators would then be integrated into one package.

FIG. 2 shows a circuit design of an individual phase circuit 50 of avoltage regulator, such as the voltage regulator 10 shown in FIG. 1. Itshould be understood that FIG. 2 is provided only for illustrationpurposes and any voltage regulator circuit can be used with theembodiments of the present disclosure. The specifics of the circuitdesign of the voltage regulator shown in FIG. 2, and other designs, areknown in the art and are not described herein so as to avoid obscuringthe present disclosure. As can be seen in FIG. 2, the phase circuit 50includes an inductor labeled “L (external)” that corresponds to one ofthe inductors 18 shown in FIG. 1. FIG. 2A shows a circuit design of amulti-phase voltage regulator circuit 80. Assuming sixteen phases, thevoltage regulator phase circuit 50 is replicated for each phase of thevoltage regulator. One control block 70 drives all the phases, and canbe configured to drive up to n phases depending on the maximum number ofvoltage regulator modules that may be aggregated together into onevoltage regulator as described below. The main inputs are the referencevoltage (VREF shown in control block 70 of FIG. 2A), along with thecontrol settings for the desired voltage. The output of each phase isthe signal VCOIL provided through the attached, corresponding inductor(L). VREF is compared to the desired voltage. If VREF is lower, thesignal HS GATE (FIG. 2) is enabled, raising the voltage at the output.If VREF is higher, the signal LS GATE (FIG. 2) is enabled, lowering theoutput voltage. This operation is continuously performed to drive thevoltage in the device connected to the output (as measured by thefeedback mechanism VREF) to the target voltage.

FIG. 3 illustrates a portion of a wafer 100 on which multiple voltageregulator modules 110 of the type shown in FIG. 1 are arrayed out on thewafer 100. Specifically, an array of twelve voltage regulator modules110 are shown in FIG. 3, though this number is selected simply forillustrative purposes. Scribe lines 150 are shown between each module.The wafer 100 can be cut, in a selective manner, along one or morescribe lines 150 into different sized dies based on the number ofvoltage regulator modules 110 required for an individual design, e.g. 1,2, 4, or 8 modules per die. It should be appreciated that the number ofvoltage regulator modules 110 per chip need not be a power of 2 and anynumber between 1 and the total number of voltage regulator modules 110on the wafer 100 could be selected. FIG. 4A, FIG. 4B and FIG. 4Cillustrate chips 200A, 200B and 200C having four, two and one voltageregulator modules 110, respectively. For example, the voltage regulatorchip 200A could be formed by cutting along scribe line 150 a and/or 150b. The voltage regulator chip 200B could be formed by cutting alongscribe line 150 a and 150 c or 150 e. That same scribe line selectionwill also provide a voltage regulator chip 200 c. It should beunderstood that the voltage regulator chip size, and thus the number ofvoltage regulator modules, is selected based on the number of voltagerails needed in the package and/or the current requirements of eachrail.

FIG. 5 schematically illustrates a multichip package 300 including avoltage regulator chip 310 and a multi-voltage rail chip 320, such as aCPU chip having multiple voltage domains, according to certainembodiments. In this example, the voltage regulator chip 310 includesN-number voltage regulator modules and the chip 320 includes N voltagedomains. In the illustrated embodiment, N is four though it should beunderstood that this is for illustrative purposes only and N can be anyinteger number. Voltage regulator chip 310 includes identical voltageregulator modules 312 a, 312 b, 312 c and 312 d formed on a common diein the manner discussed above in connection with FIG. 4A. The chip 320includes four voltage domains, namely a first voltage domain 322 a, asecond voltage domain 322 b, a third voltage domain 322 c and a fourthvoltage domain 322 d. Each voltage regulator module 312 is connected toan associated with a respective one of the voltage domains 322 throughthe package. The package provides, for example, a connection 332 athrough which a reference voltage and/or control signals are providedfrom the first voltage domain 322 a of the chip 320 to the input solderbumps of first voltage regulator module 312 a of the voltage regulatorchip 310. The package also provides a common electrical connection(rail) 334 a connecting the output solder bumps of the voltage regulatormodule 312 a to the first voltage domain 322 a. Similarly, the packageprovides connections 332 b and 334 b between the second voltage domain332 b and second voltage regulator module 312 b; connections 332 c and334 c between the third voltage domain 332 c and third voltage regulatormodule 312 c; and connections 332 d and 334 d between the fourth voltagedomain 332 d and fourth voltage regulator module 312 d. In thisembodiment, one voltage regulator chip 310 includes multiple voltageregulator modules 312 and each is configured to independently control arespective voltage rail from a respective voltage references (Vref) ofthe respective voltage domain on the chip 320. As such, one voltageregulator die can provide multiple reference voltages for a multi-domainchip.

FIG. 6 schematically illustrates a multichip package 400 including avoltage regulator chip 410 and chip 420 having a single voltage rail,such as a CPU chip having one voltage domain 322, according to certainembodiments. In this example, the voltage regulator chip 410 includesN-number of voltage regulator modules 412. In the illustratedembodiment, N is four though it should be understood that this is forillustrative purposes only and N can be any integer number. Voltageregulator chip 410 is identical to voltage regulator chip 310 (FIG. 5)and includes identical voltage regulator modules 412 a, 412 b, 412 c and412 d formed on a common die in the manner discussed above in connectionwith FIG. 4A. Unlike the chip 320, the chip 420 includes one voltagedomain, or at least only one voltage domain with a rail that is provideda regulated voltage by the voltage regulator chip 410. The voltageregulator module 412 are coupled to work together to supply a singleregulated voltage to voltage domain 432 of the chip 420. The packageprovides, for example, a shorted connection 432 through which a singlereference voltage and/or control signals are provided from the voltagedomain 422 of the chip 420 to the input solder bumps of each of the fourvoltage regulator modules 412 a, 412 b, 412 c and 412 d of the voltageregulator chip 410. The package also provides a common electricalconnection (rail) 434 connecting the output solder bumps of all fourvoltage regulator modules 412 a, 412 b, 412 c, 412 d to the voltagedomain 422 of the chip 420. Control signals can be coupled through thepackage (e.g., through electrical connection 436) from the controlcircuit of one of the voltage regulator modules (e.g., 412 a) to theother voltage regulator modules (412 b, 412 c, 412 d) in a master andslave configuration (hereinafter, “master slave”). In this embodiment,one voltage regulator chip 410 including multiple voltage regulatormodules 412 configured to provide a single regulated voltage but at ahigher current than is available from only one voltage regulator module.That is, the outputs of the voltage regulator modules are shortedtogether to provide the regulated voltage output to the high currentvoltage domain of the chip 420. In embodiments, since only one voltagereference (Vref) is needed to regulate the voltage, it is supplied toone of the voltage regulator modules 412 a, which acts as a “Master”controlling the other “Slave” modules to keep all the phases of thevoltage regulator modules in synchronization. This control is connectedthrough the package, and fuses can be used to select which voltageregulator modules are master versus slaves. Specifically, if we assumeeach voltage regulator module is configured like the voltage regulatordesign of FIG. 2A, then the control circuit 70 of the slave voltageregulator modules (e.g., 412 b, 412 c, 412 d) can be turned off orotherwise isolated (e.g., by triggering a fuse) and the phase controlsignals 60 a to 60 p from the control circuit 70 (FIG. 2A) of thevoltage regulator module 412 a can be connected to the correspondingphase circuits 50 a to 50 p of the slave voltage regulator modules. Thisconnection can be made through the packaging, for example throughconnection 436 in FIG. 6.

It should be apparent from the discussion of FIG. 5 and FIG. 6 that thesame piece of silicon configured in the same way (e.g., each with fouridentical voltage regulator modules) can provide two totally differentvoltage regulators with different operating characteristics (e.g.,different number of rails and/or current capabilities) only by using thesame voltage regulator with different package configurations.

While FIG. 5 shows four voltage regulator modules providing fourseparate voltage domains, and FIG. 6 shows four voltage regulatormodules providing a single regulated voltage for a single domain, itshould be apparent that a mix of the two techniques is possible usingthe same voltage regulator and only a different package configuration.This is referred to herein as a “hybrid” configuration. For example,assume the CPU chip includes two voltage domains, with one domain beinga high current domain and the other domain being a low current domain.And assume the same voltage regulator chip 310 or 410 shown in FIG. 5 orFIG. 6, respectively. One of the voltage regulator modules could beconfigured through the packaging connections to supply the low currentdomain of the CPU chip (for example, using a configuration as shown inFIG. 5). The other three voltage regulator modules could be slavedtogether (using the technique of FIG. 6) to provide the regulatedvoltage to the high current domain of the CPU chip.

In addition to the modular voltage regulator described herein beingconfigurable for various voltage/current requirements, in certainembodiments the voltage regulator can also be configured withselectively disabled or disconnected phases of the regulator that havedefective circuitry. FIG. 7 shows an embodiment of a voltage regulator10A that is identical to the voltage regulator 10 of FIG. 1 only a phasehas been selectively disabled or disconnected because of a manufacturingdefect, for example a defective inductor 18A. This defect can bedetected during wafer sort. The solder bumps 22 corresponding to thedefective phase in area 24 are removed as shown in FIG. 7. In certainembodiments, this bump removal is accomplished through laser ablation oranother method appropriate for removing the bumps or otherwisedisconnecting the phase from the voltage regulator output. Internalfuses can be set to indicate to the control logic which phases arefunctional so that the control logic can balance accordingly.

In embodiments, if N is the maximum number of phases that are desired inthe voltage regulator, then the voltage regulator module may beconstructed with N+1 or N+2 phases, i.e., with additional phases thatcan serve to replace defective phases and that would otherwise remaininactive or disconnected in the event of no defects.

Turning to FIG. 8, a vertical cross-section is shown of a portion 500 ofvoltage regulator 10. As can be seen the voltage regulator has a devicelayer 502 formed in the silicon that provides devices (e.g.,transistors) for the control and driver circuits of the voltageregulator. A metal interconnection layer 504 is formed over the devicelayer 502 and connects the device layer to the inductor coil 508, whichis formed in a dielectric layer 506. The inductor coil 508 is connectedto a solder bump 510. As shown in FIG. 8A, an area 500A has had the bump510 removed by laser ablation or other technique. Laser ablation worksby selectively targeting bumps attached to the defective circuitry andremoving the bumps from the surface of the silicon. Note that since thisis done for defective phase circuits, it is acceptable to slightlydamage the inductor 508 and the surrounding area during the removalprocess, since that inductor is not going to be used. Therefore, theablation does not need to be overly precise, which helps keep the costsof the process to a minimum.

While described in connection with inductor 18A being defective, itshould be apparent that the same bump removal process is effective todisconnect a phase of the voltage regulator that is defective for otherreasons, for example, a defective driver circuit associated with thephase.

FIG. 9 illustrates an alternative method to bump removal. FIG. 9illustrates a voltage regulator 10B that is identical to the voltageregulator 10A of FIG. 7 only each inductor 18 is connected to arespective solder bump or bumps by a metal or other electricallyconductive conductor 26. In this embodiment, a defective inductor 18A(or inductor connected to defective phase circuit) is disconnected atlocalized region 28 from the voltage output using a nano machiningprocess such as focused ion beam (FIB). A close up of area A is shown inFIG. 9A illustrating a cut across the metal connector 26 to disconnectthe inductor 18A from the solder bumps 22 and thus from the voltageoutput. Since the metal connecting the inductor output to the bumps isrelatively wide in the direction of the cut line (for example, incertain embodiments ten times or more wider than the given process) anddoes not have metal or circuitry underlying it, this FIB process can beautomated in certain embodiments and have a high success rate.

FIG. 10 illustrates a voltage regulator 10C that is identical to thevoltage regulator 10 of FIG. 1 except with respect to the center region14A of the die where the drivers and control logic are located.Specifically, the size of the die 12 is largely dictated by the numberof inductors and the logic (drivers and particularly control logic)takes up a relatively small part of the silicon. As such, the voltageregulator is provided with redundant control logic 34 in addition tocontrol logic 32. Voltage regulator drivers 30 a and 30 b are alsoprovided for the phase circuits. When the chip is manufactured, if thecontrol block 32 has a defect, the redundant control 34 can be used,assuming it is defect free. Since the control logic is a small sectionof the module, it is unlikely that both control logic 32 and redundantcontrol logic 34 would have defects. Fuses would be used to determinewhich control block is active. For example, if control logic 32 isdefective, for example due to a manufacturing defect, then redundantcontrol logic 34 can be connected to the driver circuits by triggeringany necessary fuses to connect control logic 34 and disconnect controllogic 32. In embodiments, the unused control block 32 is power-gated sono power is wasted on it during operation of the voltage regulator.

Using the techniques described in FIGS. 8, 8A, and FIGS. 9 and 9A alongwith the redundant control logic approach of FIG. 10 allows for avoltage regulator to be salvaged regardless of inductor, phase circuitor control logic defects, and do so in a cost effect manner. Providingredundant control logic, along with the aforementioned capability todisable phases with defective inductors or voltage drivers, allows forthese voltage regulator modules to be manufactured at a very high yieldrate.

FIG. 11 illustrates a packaged device 800, according to certainembodiments. The packaged device 800 includes a voltage regulator 810having inductors 815 and conductive bumps 820. The voltage regulator 810is fabricated in accordance with certain embodiments described herein.The packaged device 800 also includes a chip, such as a CPU chip 825, towhich the voltage regulator 810 supplies one or more regulated voltages.The CPU chip includes conductive bumps 830. The voltage regulator 810and CPU chip 825 are mounted on a substrate 835 and electricallyconnected to one another through the connections 840 of the substrate835. The substrate 835 includes conductive bumps 845 that allow for thepackaged device 800 to be coupled in a larger system, e.g., to amotherboard of a computer. In certain embodiments, the structure 800shown in FIG. 11 can, but need not be, encapsulated in an encapsulationlayer.

FIG. 12 illustrates a method of making a voltage regulator, according tocertain embodiments. At step 600 a wafer is produced having an array ofidentical voltage regulator modules fabricated thereon. In certainembodiments, the voltage regulator modules are multi-phase voltageregulator modules.

At step 602, a selection is made regarding the number of voltageregulator modules needed for a given design. In embodiments, the numberof voltage regulator modules of the design is two or greater.

At step 604, the wafer is cut along at least one scribe line to providea die having the selected number of voltage regulator modules.

At step 606, a package configuration is selected. Specifically, it isdetermined whether (a) each voltage regulator module will independentlyoperate and provide its own respective regulated voltage (e.g., to drivea multi-domain chip such as in FIG. 5), (b) the voltage regulatormodules are to be coupled together to provide a voltage regulated outputfor a high current design (e.g., to drive a single power rail as in FIG.6) or (c) a hybrid design is desired, where the voltage regulatormodules are configured to drive multiple domains and where those domainshave different current requirements.

At step 608, if option (a) is selected, the die is packaged with atleast one other die for which it is providing a regulated voltage usingthe appropriate package connections.

At step 610, if option (b) is selected, the die is packaged with atleast one other die for which it is providing a regulated voltage usingthe appropriate package connections.

At step 612, if option (c) is selected, the die is packaged with atleast one other die for which it is providing a regulated voltage usingthe appropriate package connections.

At step 614, the method ends. It should be apparent from the foregoingthat the same voltage regulator die can be used to provide multiplevoltage regulator designs with no changes to the voltage regulator andonly the package connections varying.

FIG. 13 illustrates a method of reconfiguring a voltage regulator moduleto account for defects, according to certain embodiments. This methodmay be practiced, for example, as part of or after step 600 in themethod of FIG. 12. At step 700, it is determined whether a phase of amulti-phase voltage regulator module is defective. The defect may be aninductor defect or a defect in the driver that drives a phase of thevoltage regulator.

If a defect is detected, at step 702, the voltage regulator output isdisconnected from the inductor associated with the defective phase. Thisdisconnection can, for example, involve removing the solder bumpsconnected to the inductor of the defective phase or cutting a conductiveconnection between the solder bumps and the inductor.

At step 704, it is determined whether a control circuit of the voltageregulator is defective.

At step 706, if a defect is determined, then a redundant control circuitis selected for use in the voltage regulator.

At step 708, the method ends, which may involve proceeding to step 602or 606 of FIG. 6.

It should be apparent from the foregoing description that the ability toaccommodate multiple design requirements from a single voltage regulatordie can greatly reduce the time and expense associated with designingcustom and specific voltage regulators, while also offering improvementsin yield. For example, the master array of voltage regulator modules canbe fabricated in high volumes, which provides economies of scale as wellas affords opportunities for manufacturing improvements that follow highproduction volumes. In certain embodiments, these benefits are furtherenhanced by also using techniques described herein for removingdefective phases of multi-phase voltage regulators (whether attributableto defective components, such as defective inductors, or to defectivevoltage regulator phase drivers), thereby further increasing yield.

In an embodiment, a device includes a semiconductor die, thesemiconductor die having formed thereon a plurality of multi-phasevoltage regulator modules of the same design formed on a commonsemiconductor substrate. In an embodiment, the multi-phase voltageregulator module includes a plurality of inductors, with each inductorassociated with a respective phase of the multi-phase regulator module.In an embodiment, the voltage regulator module includes a plurality ofconductive bumps forming an output of the voltage regulator module,wherein one of the voltage regulator modules has a defective phase,wherein the defective phase is disconnected from the output bydisconnecting the inductor associated with the defective phase from theoutput.

In an embodiment, a packaged device includes a package; a semiconductordie, the semiconductor die having formed thereon a plurality of voltageregulator modules of the same design formed on a common semiconductorsubstrate; and a chip electrically coupled to the semiconductor diethrough the package. Electrical connections between the chip and the diethrough the package are configured such that the plurality of voltageregulators modules of the same design operate together to provide aregulated voltage to the chip or operate independently to provide aplurality of different regulated voltages to the chip. In an embodiment,the chip includes first and second voltage domains, and thesemiconductor die includes a first voltage regulator module from theplurality of voltage regulator modules coupled to a first voltage railof the first voltage domain and a second voltage regulator module fromthe plurality of voltage regulator modules coupled to a second voltagerail of the second voltage domain. In an embodiment, the first voltageregulator module provides a first regulated voltage different from asecond regulated voltage provided by the second voltage regulatormodule. In an embodiment, the first voltage regulator module is coupledto the chip through the package to receive a first reference voltagefrom the chip, and the second voltage regulator module is coupled to thechip through the package to receive a second reference voltage from thechip. In an embodiment, the chip includes a first voltage domain, andthe semiconductor die includes a first voltage regulator module and asecond voltage regulator module from the plurality of voltage regulatormodules having outputs coupled together to a voltage rail of the firstvoltage domain. In an embodiment, the first and second voltage regulatormodules are operable in a master slave configuration. In an embodiment,the first voltage regulator module is coupled to the chip through thepackage to receive a reference voltage from the chip, and a controllogic in the first voltage regulator module is coupled to the secondvoltage regulator module through the package to provide control signalsto the second voltage regulator module. In an embodiment, the first andsecond voltage regulator modules are N-phase voltage regulator modules,where N is an integer number greater than 1, and wherein the controlsignals include N phase control signals for the N phases of the secondvoltage regulator module. In an embodiment, the voltage regulator moduleis a multi-phase voltage regulator module including a plurality ofinductors, with each inductor associated with a respective phase of themulti-phase regulator module. In an embodiment, the voltage regulatormodule includes a plurality of conductive bumps forming an output of thevoltage regulator module, wherein one of the voltage regulator moduleshas a defective phase, wherein the defective phase is disconnected fromthe output by disconnecting the inductor associated with the defectivephase from the output.

In an embodiment, a method of defect correction for a multi-phasevoltage regulator, includes the steps of: manufacturing a voltageregulator having a plurality of phases, a plurality of inductorscorresponding to the plurality of phases, and a voltage regulatoroutput; identifying a defective phase from the plurality of phases; anddisconnecting the voltage regulator output from the defective phase. Inan embodiment, each inductor is coupled to a respective conductive bumpcorresponding to the voltage regulator output, and the disconnectingstep includes removing the conductive bump associated with the inductorcorresponding to the defective phase. In an embodiment, the removingstep includes removing the conductive bump by laser ablation. In anembodiment, each inductor is coupled to a respective conductive bumpcorresponding to the voltage regulator output, and the disconnectingstep includes cutting an electrical connection between a conductive bumpand the inductor corresponding to the defective phase. In an embodiment,the cutting step includes using focused ion beam. In an embodiment, thevoltage regulator includes control logic and redundant control logic,and the method further includes the step of engaging the redundantcontrol logic and disengaging the control logic if the control logic isdefective. In an embodiment, the engaging and disengaging includestriggering at least one fuse in the voltage regulator module.

In an embodiment, a method of making a voltage regulator includes thesteps of: forming an array of voltage regulator modulators of the samedesign formed on a common semiconductor substrate; selecting a number ofregulator modules to be included in a voltage regulator from the arrayof voltage regulator modulators, wherein the number is an integer numbergreater than 1; cutting the wafer to provide a die including theselected number of voltage regulator modules; and packaging the die witha chip such that the die is electrically coupled with the chip toprovide a regulated voltage. In an embodiment, the chip includes firstand second voltage domains, and the method further includes coupling afirst voltage regulator module from the plurality of voltage regulatormodules to a first voltage rail of the first voltage domain and couplinga second voltage regulator module from the plurality of voltageregulator modules to a second voltage rail of the second voltage domain.In an embodiment, the chip includes a first voltage domain, and thesemiconductor die includes a first voltage regulator module and a secondvoltage regulator module from the plurality of voltage regulatormodules, and the method further includes coupling outputs coupled of thefirst and second voltage regulator modules together to a voltage rail ofthe first voltage domain. In an embodiment, the method further includescoupling the first and second voltage regulator modules in a masterslave configuration.

In an embodiment, a device includes a package; a semiconductor die, thesemiconductor die having formed thereon a plurality of voltage regulatormodules of the same design formed on a common semiconductor substrate;and a CPU chip electrically coupled to the semiconductor die through thepackage to receive a regulated voltage from the semiconductor die,wherein the CPU chip includes first and second voltage domains, whereina first voltage regulator module from the plurality of voltage regulatormodules is coupled through the package to the first voltage domain toreceive a first reference voltage and to provide a first regulatedvoltage using the first reference voltage, and wherein a second voltageregulator module from the plurality of voltage regulator modules iscoupled through the package to the second voltage domain to receive asecond reference voltage and to provide a second regulated voltage usingthe first reference voltage. In an embodiment, the package includes acircuit board to which the semiconductor die and the CPU chip arebonded.

In an embodiment, a device includes a package; a semiconductor die, thesemiconductor die having formed thereon a plurality of voltage regulatormodules of the same design formed on a common semiconductor substrate;and a CPU chip electrically coupled to the semiconductor die through thepackage to receive a regulated voltage from the semiconductor die,wherein the CPU chip includes a first voltage domain, wherein outputs offirst and second voltage regulator modules from the plurality of voltageregulator modules are coupled together to the first voltage domain toprovide a regulated voltage using a reference voltage from the CPU chip,wherein the first voltage regulator module is coupled to the CPU throughthe package to receive the reference voltage, and wherein the secondvoltage regulator module is a slave in a master slave configuration tothe first voltage regulator module, with the first voltage regulatormodule providing control signals to the second voltage regulator modulethrough the package. In an embodiment, the package includes a circuitboard to which the semiconductor die and the CPU chip are bonded. In anembodiment, the voltage regulator modules are N-phase voltage regulatormodules and the first voltage regulator module provides N respectivecontrol signals to the N-phases of the second voltage regulator module.In an embodiment, the CPU chip includes a second voltage domain, and athird voltage regulator module from the plurality of voltage regulatormodules is coupled to the second voltage domain through the package toprovide a regulated voltage for the second voltage domain.

The foregoing outlines features of several embodiments so that thoseordinary skilled in the art may better understand the aspects of thepresent disclosure. Those skilled in the art should appreciate that theymay readily use the present disclosure as a basis for designing ormodifying other processes and structures for carrying out the samepurposes and/or achieving the same advantages of the embodimentsintroduced herein. Those skilled in the art should also realize thatsuch equivalent constructions do not depart from the spirit and scope ofthe present disclosure, and that they may make various changes,substitutions, and alterations herein without departing from the spiritand scope of the present disclosure.

What is claimed is:
 1. A device comprising: a semiconductor die, thesemiconductor die having formed thereon a plurality of voltage regulatormodules of the same design formed on a common semiconductor substrate,wherein each voltage regulator module of the same design is amulti-phase voltage regulator module comprising a plurality of phasecircuits providing corresponding outputs of different phase at a commonoutput of the voltage regulator module and control logic configured fordriving the plurality of phase circuits of the voltage regulator module,wherein the different phases of the outputs are the same for eachvoltage regulator module of the same design from the plurality ofvoltage regulator modules.
 2. The device of claim 1, wherein themulti-phase voltage regulator module comprises a plurality of inductors,with each inductor associated with a respective phase of the multi-phaseregulator module.
 3. The device of claim 2, wherein the voltageregulator module includes a plurality of conductive bumps forming anoutput of the voltage regulator module, wherein one of the voltageregulator modules has a defective phase, wherein the defective phase isdisconnected from the output.
 4. The device of claim 3, wherein thedefective phase is disconnected from the output by disconnecting theinductor associated with the defective phase from the output.
 5. Thedevice of claim 1, wherein a first voltage regulator module from theplurality of voltage regulator modules is coupled to a first voltagedomain to receive a first reference voltage and to provide a firstregulated voltage using the first reference voltage, and wherein asecond voltage regulator module from the plurality of voltage regulatormodules is coupled to a second voltage domain to receive a secondreference voltage and to provide a second regulated voltage using thesecond reference voltage, wherein the first regulated voltage isdifferent than the second regulated voltage.
 6. The device of claim 5,further comprising a chip electrically coupled to the semiconductor dieto provide the first and second reference voltages and to receive thefirst and second regulated voltages.
 7. The device of claim 6, whereinthe chip is a CPU chip.
 8. The device of claim 1, wherein the pluralityof voltage regulators modules of the same design operate together toprovide a regulated voltage in response to a reference voltage.
 9. Thedevice of claim 8, further comprising a chip electrically coupled to thesemiconductor die to provide the reference voltage and to receive theregulated voltage.
 10. The device of claim 9, wherein the chip is a CPUchip.
 11. The device of claim 8, wherein the common outputs of thevoltage regulator modules are coupled together to provide the regulatedvoltage.
 12. The device of claim 11, wherein the voltage regulatormodules are operable in a master slave configuration.
 13. The device ofclaim 12, wherein control logic in a first voltage regulator modulesfrom the plurality of voltage regulator modules is coupled to a secondvoltage regulator module from the plurality of voltage regulator modulesto provide control signals to the second voltage regulator module. 14.The device of claim 1, wherein the voltage regulator modules are coupledto a chip through a package to receive at least one reference voltagefrom the chip and to provide at least one regulated voltage to the chip.15. A device comprising: a semiconductor die, the semiconductor diehaving formed thereon a plurality of voltage regulator modules of thesame design formed on a common semiconductor substrate, wherein eachvoltage regulator module of the same design is a multi-phase voltageregulator module comprising a plurality of phase circuits providingcorresponding outputs of different phase at a common output of thevoltage regulator module and control logic configured for driving theplurality of phase circuits of the voltage regulator module, wherein thedifferent phases of the outputs are the same for each voltage regulatormodule of the same design from the plurality of voltage regulatormodules; chip electrically coupled to the semiconductor die to provideat least one reference voltage for the plurality of voltage regulatormodules and to receive at least one regulated voltage from the pluralityof voltage regulator modules.
 16. The device of claim 15, wherein thechip includes first and second voltage domains, wherein a first voltageregulator module from the plurality of voltage regulator modules iscoupled to the first voltage domain to receive a first reference voltageand to provide a first regulated voltage using the first referencevoltage, and wherein a second voltage regulator module from theplurality of voltage regulator modules is coupled to the second voltagedomain to receive a second reference voltage and to provide a secondregulated voltage using the second reference voltage, wherein the firstregulated voltage is different than the second regulated voltage. 17.The device of claim 15, wherein the chip includes a first voltagedomain, and wherein the common outputs of the plurality of voltageregulator modules are coupled together to a voltage rail of the firstvoltage domain to provide a regulated voltage.
 18. The device of claim17, wherein the plurality of voltage regulator modules includes a firstvoltage regulator module and a second voltage regulator modules operablein a master slave configuration.
 19. The device of claim 18, wherein thefirst voltage regulator module is coupled to the chip to receive areference voltage from the chip, wherein control logic in the firstvoltage regulator module is coupled to the second voltage regulatormodule to provide control signals to the second voltage regulatormodule, and wherein the first and second voltage regulator modules areN-phase voltage regulator modules, where N is an integer number greaterthan 1, and wherein the control signals include N phase control signalsfor the N phases of the second voltage regulator module.
 20. A devicecomprising: a semiconductor die, the semiconductor die having formedthereon a plurality of voltage regulator modules of the same designformed on a common semiconductor substrate, wherein each voltageregulator module of the same design is a multi-phase voltage regulatormodule comprising a plurality of phase circuits providing correspondingoutputs of different phase at a common output of the voltage regulatormodule and control logic configured for driving the plurality of phasecircuits of the voltage regulator module, wherein the different phasesof the outputs are the same for each voltage regulator module of thesame design from the plurality of voltage regulator modules, whereineach multi-phase voltage regulator module comprises a plurality ofinductors, with each inductor associated with a respective phase of themulti-phase regulator module, the inductors being coupled together atthe common output of the voltage regulator module.